Underdog role could play in Texans' favor

Elise Amendola/Associated Press

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New England Patriots free safety Devin McCourty (32) runs from Houston Texans fullback James Casey (86) after intercepting a pass from quarterback Matt Schaub during the first quarter of an NFL football game in Foxborough, Mass., Monday, Dec. 10, 2012. (AP Photo/Elise Amendola)

New England Patriots free safety Devin McCourty (32) runs from Houston Texans fullback James Casey (86) after intercepting a pass from quarterback Matt Schaub during the first quarter of an NFL football game in Foxborough, Mass., Monday, Dec. 10, 2012. (AP Photo/Elise Amendola)